Method for integrally renewing deck of oil tanker in floating state

The invention discloses a method for integrally renewing a deck of an oil tanker in a floating state, which comprises the following steps of: a, carrying out staged design on a renewing area of the deck of the original tanker, and carrying out overall strength and load regulation calculation according to the staged design; b, designing new deck subsection division according to the staging design; c, according to a load regulation calculation result, pumping ballast water into a ballast tank in the middle area; d, installing a first-stage new deck segment, and adjusting the deflection of the deck; e, installing a second-stage new deck segment, and adjusting deflection; f, installing a third-stage new deck segment, and adjusting deflection; g, installing a fourth-stage new deck segment, and adjusting deflection; and h, after welding of the transverse segmentation joints and the longitudinal segmentation joints of the fourth-stage deck is finished, finishing replacement of the whole deck replacement area. According to the deck replacement process method for the oil tanker in the floating state, the problem that the oil tanker occupies a large dock period to replace a deck is solved, the dock period is saved by 35-40 days, and the competitiveness of a company is greatly improved.