Barge Mounting Technique for Installation of Large Offshore Bridge Structure

초록

Most offshore structures have been installed with assistance of derrick crane vessels. However as the size of offshore structure increases, the barge mounting method (somtime called as IFO technique but it will be called as BM method in this paper for convenience) has been introduced and applied. And this method has proved that without heavy crane vessels, large offshore structures can be instlled safely and economically. The key of the BM method is the control of barge motion during docking and mating operations. Also to absorb impact loads and to help with load transfer during mating between substructure and deck, several damping mechanisms have been developed in the past. This paper describes the technical considerations and installation procedures illustrating detail sequence from docking to mating operatoin of a 4,500 ton bridge construction in Busan, Korea and also introduces the engineering analysis of the BM method for the specified bridge installation.