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Method and apparatus for the offshore installation of multi-ton prefabricated deck packages on partially submerged offshore jacket foundations

  • US 5,662,434 A
  • Filed: 03/14/1996
  • Issued: 09/02/1997
  • Est. Priority Date: 03/15/1995
  • Status: Expired due to Term
First Claim
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1. A lifting apparatus for placing a multi-ton deck package on an offshore jacket or partially submerged foundation, comprising:

  • a) a pair of barges, each defining a base that can support a large multi-ton load;

    b) truss means supported by the barges about the periphery of the deck package for forming a load transfer between the barges and the deck package to be placed, said truss means including a plurality of diagonally extending lift booms, each lift boom having a lower end attached to a barge and an upper end which enables attachment to the deck package;

    c) each boom comprising;

    i) a pair of longitudinally extending members;

    ii) a plurality of end caps that each removably connect to at least one longitudinally extending lift boom;

    iii) the end caps forming part of the connection between the deck package and a barge;

    d) upper and lower connection means for forming attachments of the truss means to the deck package at upper and lower respective elevational positions;

    e) said upper and lower connection means including corresponding connecting portions that enable the barges and package to quick disconnect, one of said corresponding quick connecting portions including the upper end portion of the lifting boom, said other quick connecting portion being positioned at said upper elevational position; and

    f) means for lowering the combination of the truss means and the supported deck package with respect to the jacket or partially submerged foundation during placement of the deck package on the jacket or partially submerged foundation.

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