Beach area cast-in-place pile construction method based on ultra-long spiral drilling machine

The invention discloses a mud flat cast-in-place pile construction method based on an ultra-long spiral drilling machine, and aims to solve the problem of difficulty in drilling and steel bar planting of an ultra-long cast-in-place pile according to specific assembling and manufacturing steps of an ultra-long drilling rod and a steel bar cage. The influence of a special geological structure of a mud flat area on construction is overcome through treatment of a drill rod and a specially-made drill cleaning device; the problems of overlarge bending degree and positioning downward insertion during hoisting of the reinforcement cage are solved through the guide-in rod and the hopper. Comprising the following steps: (1) assembling a drill rod, placing a drilling machine in place, aligning the center of a pile position, and setting a depth mark; (2) manufacturing a conical head super-long reinforcement cage; (3) drilling; (4) pouring concrete; (5) arranging a roll shaft type anti-overflow hopper; (6) hoisting the re