침몰선박의 인양 기법과 인양력 평가에 관한 연구

Abstract

In this study, hydraulic model experiment and field experiment carried out to investigate the lifting force of submerged ship. To accomplish the purpose of study, collected the cases related on salvage both home and abroad, arranged the process and suggestions of salvage. Next, hydraulic model experiment carried out in due consideration of physical parameter(the shape of ship, bottom condition, current speed, water depth, salvage condition). Finally, The important factors suggested on salvage the submerged ship by field experiment. The main results are as follows. 1) As the results of hydraulic model experiment, nondimension lifting force have the range 50 to 70 % of model weight in the Pohang and Tongyeong case, this result shows bottom condition does not affects lifting force during salvage. Nondimension lifting force have the range 70 to 180 % of model weight in the Shinan case, the result shows the influence of the bottom is very important. 2) As the results of field experiment, the lifting force of box type block shows similar patterns with hydraulic model experiment. The lifting force continuedly increases, maximum value occurs as experiment model separated from bottom. Next, constant value occurs during underwater salvage, the lifting force of real ship increases as ship appeared gradually on the water surface. 4) The lifting force of real ship increases as ship appeared gradually on the water surface, it becomes the initial weight as internal sea water go out from ship. As compared with model experiment, the difference in the process and the other procedure has similar results. From the results, the field salvage needs to consider the external shape and internal condition of ship.