Bottom supporting rod device for bathyscaph and operation method

The invention relates to a bottom supporting rod device for a bathyscaph and an operation method; the bottom supporting rod device comprises an embedded pile, a limiting boss is welded to the inner bottom face of the embedded pile, a bottom supporting rod is inserted into the position above the limiting boss in a matched mode, the bottom supporting rod is divided into a lower half part and an upper half part, the lower half part is of a hollow thin-wall structure, and the upper half part is of a solid structure; the outer wall face of the bottom supporting rod is sleeved with a high-strength reinforced hose, the upper portion of the high-strength reinforced hose is connected with the upper half part through an upper fastening ring, the lower portion of the high-strength reinforced hose is connected with the lower half part through a lower fastening ring, and a plurality of steel cables are welded to the portion, located outside the high-strength reinforced hose, between the upper fastening ring and the lower