This article describes the processes needed to prepare foundation reinforcement for large support piles for an existing bridge in San Francisco Bay, USA. Specialist contractors have worked, in a drilling rig share agreement, to install large diameter rock-socketed cast-in-drilled-hole reinforced concrete piles. The piles are next to, and incorporated in, the existing bell-shaped pier foundations, and are part of strengthening work to prevent seismic failure. They feature pile caps which will act as shear diaphragms to limit lateral movement and will take the shear forces transferred between them and the existing foundations. A new circulation drill with shrouded full-face bit was developed. Precast concrete positioning templates were placed centrally between the foundations and steel casings were hydraulically driven through the pile caps into the seabed to the underlying bedrock. The casing was cleaned out, drilling carried out into the rock, and concrete poured in to form the socketed pile.

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    Hemming Information Services

    32 Vauxhall Bridge Road
    London,   United Kingdom  SW1V 2SS
  • Publication Date: 2004


  • English

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Filing Info

  • Accession Number: 00988531
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Apr 4 2005 12:00AM