DOUBLER STRUCTURE FOR HULL REINFORCEMENT

PURPOSE:To make a double shorter in size as well as aim at reduction in the number of steel materials and welding processes, by installing an expanded taper part, whose plate width grows larger toward each end side, in both end parts of a long doubler plate material extending in a vertical direction at the same width. CONSTITUTION:In the case where length of the existing hull is to be extended in order to increase the extent of loading capacity, in case of a container ship by way of example, a long reinforced doubler 1 is installed in a strength deck or a bottom deck to make up for a shortage of longitudinal strength. Also there is provided with an expanded taper 4 so as to increase its plate width toward an end side 3 at an end part 2 of the doubler 1. And, a taper 5 in a plate width direction is installed in this end side 3, and the doubler 1 and a base plate 7 are joined together by means of fillet welding. Stress in the doubler end part is prevented from growing larger, and there is unnecessary to extend the doubler up to a position where a longitudinal stress is made smaller, thus reduction in the number of steel materials and welding processes is well promotable.