Construction of a dry dock included the provision of two prestressed concrete floating caisson dock gates. Investigations for the foundation of the reinforced concrete cill of the dock gate indicated that the depth to rock head was too great to permit the structure to be founded directly onto the rock. Pile foundations were constructed and driven through the overburden and socketed into bedrock. In order to resist the horiztonal forces exerted by the dock gate structure three reinforced concrete strong points were constructed and tied down with 85 anchors drilled into the rock. Unconsolidated deposits at the site of the dock gate included sand, gravel and cobbles. Bedrock consisted of very strong sandstone and silstone. The design of the rock anchors are described with respect to the uplift capacity, rock-grout bend and tednon-grout bond. The construction of the permanent rock anchors enables a large additional restraining force equivalent to several thousand tons of concrete to be applied behind a portion of the dock gate cill structure, thus avoiding the necessity for large scale excavation of superficial material and its replacement with mass concrete. The major advantages of a prestressed anchor system are that not only can a designer be assured of the magnitude of the restraining force being applied to his structure, but also the adequacy of every member installed is demonstrated.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Authors:
    • Turner, M J
  • Publication Date: 1977-4

Media Info

  • Features: Figures; References;
  • Pagination: p. 37-41
  • Serial:
    • Volume: 10
    • Issue Number: 3
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00165949
  • Record Type: Publication
  • Report/Paper Numbers: Analytic
  • Files: TRIS
  • Created Date: Apr 26 1978 12:00AM