Completely recoverable tongue-and-groove block assembling section steel bottom plate of steel suspension box under complicated oceanic condition

The invention discloses a completely recoverable tongue-and-groove block assembling section steel bottom plate of a steel suspension box under a complicated oceanic condition. The bottom plate comprises an assembling bottom plate, wherein the assembling bottom plate comprises a middle bottom plate B; bottom plates A are symmetrically arranged on the two sides of the bottom plate B and are in buttjoint together in a tongue-and-groove manner; arch notches allowing steel pile casings to penetrate through are formed in the bottom plates A; middle opposite pulling finish rolling threaded steel transversely penetrating through the bottom plates A and the bottom plate B is arranged in the middle of the assembling bottom plate; threaded steel suspension and lowering holes are formed in the bottomplates A and the bottom plate B; construction platform supports perpendicularly extend out from the periphery of the assembling bottom plate; after bearing platform construction is finished, the assembling section steel botto