More than half of the orthotropic cracks on the deck, ribs were reinforced by steel plates. In project general, bolts were screwed with using the turn-of-nut method. After measuring and determining the optimum angle required for bolts ensuring 18KN by using the Skidmore-Wilhelm test device, the required angle was adjusted with torque machines, and all bolts were screwed with this angle. Thus, reinforcement was done by friction force stemmed from pressure between plates and rib.