This article describes a new integrated hydraulic piling rig that incorporates a hydraulically lifted drop hammer mounted on a hydraulic base machine. The principal features of the rig include: Hydraulic operation; high mobility and manoeuverability on site; reasonably low nose levels; quick erection and dismounting on site; and, ease in transportation. The piling rig has a leader mast consisting of two telescopic sections-an inner upper and a lower outer-and removable foot and head section; maximum overall leader length is 18.8 m. The rake of the mast is controlled by two hydraulic rams. Two telescopic steel tube rear braces connect the base of the machine and the slides of the upper raking hydraulic ram mounted to the rear of the outer leader; the right hand brace is fitted with a hydraulic ram at its lower end, providing for the lateral inclination of the leader. A feature of the machine is the hydraulically operated hammer, with a 3 ton free-fall drop hammer. Stress wave measurements have shown this hammer falling 250 mm to have a similar efficiency as a 4 ton single-line drop hammer falling 500 mm. The rig is also equipped with an automatically actuated hammer drop controller. An automatic hammer blow counter can be set for any number of blows up to 90,000. Other equipment include an acoustic warning device in the cab which limits the height of the hammer guide above leader foot level, and a leader mast rake indicator to give the longitudinal and lateral mast inclination. The base machine is quiet in operation and noise levels in the cab are low. A pile driving anayser is described that can determine for every hammer blow, the pile heaving capacity, transferred energy, maximum compression, maximum tension force, maximum impact velocity, and maximum acceleration.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Publication Date: 1978-3

Media Info

  • Features: Figures;
  • Pagination: p. 19-21
  • Serial:
    • Volume: 11
    • Issue Number: 2
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00174412
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 14 1978 12:00AM