Steel protecting tube for preventing hole collapse and reducing of drilling pile under deep sea silt and construction method for steel protecting tube

The invention discloses a steel protecting tube for preventing hole collapse and reducing of a drilling pile under deep sea silt. The steel protecting tube comprises a steel protecting tube body with the thickness of 1cm, wherein a steel ring is welded at the lower end side of the steel protecting tube body; the thickness of the steel ring is 1cm; the height of the steel ring is 30cm. The invention also discloses a construction method for the steel protecting tube. The construction method comprises the following steps: the steel protecting tube body with the thickness of 1cm is produced; the steel ring is welded at the lower end side of the steel protecting tube body, wherein the thickness of the steel ring is 1cm, and the height of the steel ring is 30cm; welding seams between sections are reinforced; at the position of the drilling pile, the steel protecting tube body is drilled by a vibrating hammer; the bottom of the protecting tube body is required to penetrate through a silt layer and enter bottom clay by a depth of 1m; the top surface of the protecting tube body is required to be exposed out of the ground by 1m; then a rotary drilling rig is used for drilling, descending a reinforcing cage and casting piles in the protecting tube body; subsequent chiseling off of the pile head, pile testing, pile splicing and column connecting construction can be smoothly operated in the steel protecting tube body. According to the steel protecting tube and the construction method disclosed by the invention, by adopting an improved deep steel protecting tube, a pile base is smoothly constructed, the subsequent chiseling off of the pile head, the pile splicing and the column connecting can be smoothly operated in the steel protecting tube, and the wall protecting action for the construction of subsequent working procedures is realized.