A method for shortening afloat a very large crude carrier by means of a watertight transverse cofferdam is described. The method permits completely dry operations both when cutting the ship into three parts (while disconnecting the bottom plates and stiffeners) and when joining together the end sections (welding of the underwater structures). During the initial approach to the problem it became obvious, on the basis of theoretical calculations, that it would be impossible to eliminate the shear force and bending moment acting on the two sections to be cut; therefore, a series of linking means was designed to bear the residual shear and bending stresses that, to the authors' knowledge, were unavoidable in view of the uncertainties existing as to the longitudinal weight distribution. To ensure correct loading of these linking means, proper ballast transfers were arranged so that the ship was maintained in a slightly hogging condition while the bottom was being cut, and then in a slightly sagging condition while the deck was being cut. These linking devices were equipped with strain gages, so that they worked as actual load cells.

  • Availability:
  • Supplemental Notes:
    • Journal article
  • Authors:
    • Pondenzana-Bonvino, C
    • Tedeschi, R
    • Boote, D
  • Publication Date: 1988-7

Media Info

  • Pagination: 9 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00655668
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM