GEODRILLING - WATSON 3000 MAKES UK DEBUT ON M25 PILING

The economical drilling range for the machine being used on the M25 orbital motorway at enfield is from 18 in (457 mm) to 9 ft (2.74 M) diameter and for depths up to 110 ft (33.5 M). The unit contains a hydraulic slide, with 1.22 M of travel for positioning and a hydraulic swing for alignment and dumping of spoil away from the hole. The mast accommodates a triple telescopic kelly bar, to give good drill depths. One of the six piled structures on the motorway involves a total of 58 piles, 18 for the abutments and 40 for the two piers. The structure required vertical and 1 in 6 raked piles up to 20 M deep. After open-hole augering at 600 mm, a full depth reinforcing cage made up of12 x 32 mm mild steel bars, helically bound was inserted and the shaft filled with ready-mix cement. To ensure a minimum of settlement, a driven cast in situ technique was adopted for an aquaduct over the motorway. A fundex rig was used to drive a tube a further 1 M or more down a pre-bored 15-16 M augered hole. Similar reinforcement and concreting was used. An outline is given of other possible configurations and operating modes of the rig. The supplement geodrilling also contains the following articles: looking for future energy beneath the past, and: versatile drill rigs designed for mobility. (TRRL)

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Publication Date: 1980-10

Media Info

  • Features: Photos;
  • Pagination: p. 37-43
  • Serial:
    • GROUND ENGINEERING
    • Volume: 13
    • Issue Number: 7
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00334995
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1981 12:00AM