A ship flat ground construction method comprises the steps that a
slipway is built on the flat ground, a plurality of transverse grooves are formed in the plane of the
slipway, and air bags are installed in the transverse grooves;
welding of the bottom plate of the whole ship is completed in a fragmentation
assembly welding mode; the center line of the bottom plate of the whole ship is calibrated by adopting a direct line pulling and marking method, and then the
position line of each component is calibrated;
welding of the inner bottom plate is completed by adopting a fragmentation
assembly welding method, the inner bottom plate is connected with the double-layer bottom framework, and installation of the double-layer bottom is completed; when the inner bottom plate is assembled and welded, the shipway on the two sides of the inner bottom plate is assembled with the shipway on the left side and the shipway on the right side of the inner bottom plate; assembling, welding and painting the front bulkhead, the middle bulkhead and the rear bulkhead of the cargo hold while assembling the left and right side ultra-long blocks; the bow and the
stern of the whole ship are manufactured in a segmented mode at the same time, then the whole ship is integrally folded to be formed, outfitting assembling is conducted, and finally the head segment and the
tail segment are sequentially assembled; and main and auxiliary machines and the
superstructure are hoisted on the ship. The shipbuilding construction period can be shortened, the shipbuilding cost is reduced, and the shipbuilding quality is improved.