The difference between the outside diameter of the SSAW steel pipe diameter and pipe joints something greater than the height of the intermediate layer square steel stent; steel square bottom bracket height is greater than the topmost square steel bracket height; bottom square steel bracket the intermediate layer is greater than the height of the square steel bracket height; spiral pipe spiral pipe plant in the same layer, the adjacent ends of two steel drill pipe joints stuff mutual distance staggered arranged along the longitudinal direction of the drill pipe; in two adjacent steel pipe, two upper and lower drill pipe coupling end things shifted away from each other are arranged along the longitudinal direction of the drill pipe; poor thing drill pipe joints and the outer diameter of the steel pipe drill pipe outside diameter greater than the topmost square steel bracket height.