Procedure and pontoon for mounting a deck on a floating sea engineering substructure

摘要

A technique for the installation of a deck on an offshore substructure is particularly useful with a floating substructure. Two independent pontoons (10) each have two columns (14) spaced apart from each other that extend upwardly from the pontoon (10). On each pontoon (10), a support beam (16) attached to the columns (14) spans the space between the columns. Each pontoon (10) is provided with ballast tanks (18,20) that allow the pontoons to be selectively ballasted or de-ballasted to control pontoon depth for receiving a deck or installing a deck on the offshore substructure. The pontoons (10) may be ballasted down during transit of the deck such that the main body portion of the pontoons is below significant wave action and the columns (14) present a relatively small water plane area. The pontoons (10) allow the deck to be placed directly above the offshore substructure. For a floating substructure, the pontoons (10) are ballasted while the floating substructure is simultaneously de-ballasted to transfer the deck to the floating substructure. IMAGE