The invention provides a
moon pool bottom cover in-dock tightness test method and device, and the method comprises the following steps: S1, drawing an FRXX rib
bit line on a port or a starboard of a dock bottom, the FRXX rib
bit line being a center line in the width direction of a
moon pool bottom cover; s2, the module vehicle is hoisted to the dock bottom, and
steel plates and rubber sheets are laid in sequence; s3, the watertight tool box is hoisted to the module vehicle; s4, the height of the module vehicle is reduced to 1150-1200 mm, and the module vehicle enters along an FRXX rib
position line; s5, the module vehicle generates lifting force to jack the watertight tool box, and a sealing rubber strip on the upper surface of the watertight tool box tightly presses the
moon pool bottom cover to form a closed
water pressure space; and S6, applying
water pressure to the watertight tool box until the tightness test step is completed. The problems that the installation and debugging efficiency is low, and single-point stress is uneven are mainly solved. The moon
pool bottom cover is directly transported, jacked and installed through the module vehicle, it is ensured that a tightness test is completed before the moon
pool bottom cover is undocked, the moon
pool bottom cover is completely installed, the precision meets the requirement, and the shipbuilding period is shortened.