Hydrostatic test structure of marine LNG liquid cargo tank and design method thereof

The invention discloses a hydraulic pressure test structure of a marine LNG liquid cargo tank and a design method of the hydraulic pressure test structure. The hydraulic pressure test structure comprises a hydraulic pressure test saddle, a detachable bearing beam, a reinforced concrete beam, a prestressed pipe pile and a fixed support, the hydraulic pressure test saddle is supported below the liquid cargo tank; the detachable bearing beam is detachably connected with the hydrostatic test saddle through a fixing piece; the detachable bearing beam and the reinforced concrete beam are connected through temporary welding; the plurality of prestressed pipe piles are distributed at the bottom of the reinforced concrete beam; the two fixed supports are symmetrically installed on the left side and the right side of the hydrostatic test saddle. The detachable bearing beam and the hydrostatic test saddle are combined to participate in stress calculation, and loads are intensively applied below the detachable bearing be