Two new diesel pile hammer models, the B25 and B35, have been used in preproduction trial work, installing sheet and H piles respectively under particularly hard driving conditions in morainic ground in the north of Scotland. The B25 was used to install pairs of 5 sheet pils for the dry dock cut-off wall at a platform construction site on the bank of a loch. The b35 was used to drive H-piles of 235 kg/m for pier foundation for a highway bridge. The double-acting diesel hammer is basically a 2-stroke diesel engine with its double speed capability achieved by increasing the striking rate while maintaining an impact energy comparable to that available from an equivalent single-acting machine. The hammers described here employ an air expansion (or vacuum) spring which approximates closely to the constant force spring. A further advantage of this mechanism is that a considerable variation in striking rate takes place as the strok is varied, and this makes possible a fairly accurate assessment of the energy per blow simply by counting the blows/minute. Comparison of the B25 with the similar DE50B shows that the average time of driving with the B25 was about half that with the DE50B. The performance of the B35 was compared to that of the DE50B and was considered to be outstanding.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Publication Date: 1976-7

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 46-48
  • Serial:
    • Volume: 9
    • Issue Number: 5
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00141096
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM