Double thread nut type piecing devices of bored concrete pile steel pipe

The utility model discloses a double thread nut type piecing devices of bored concrete pile steel pipe, each section steel pipe both ends all is equipped with the external screw thread, these piecingdevices include a nut body, and the centre bore upper end of nut body is equipped with and is used for the last internal thread that closes soon with the external screw thread of one section last steel pipe lower extreme, and the centre bore lower extreme of nut body is equipped with and is used for the lower internal thread that closes soon with the external screw thread of next section steel pipe upper end, goes up internal thread and lower internal screw thread screw thread opposite direction, it does not have the line loop -line to be equipped with two internal screw threads of wall in themiddle of the centre bore. These piecing devices only need two workman's operations just can accurately realize two steel pipes butt joints from top to bottom fast and demolish. 本实用新型公开了种灌注桩钢导管的双螺纹螺母式接头装置，每段钢导管两端均设有外螺纹；该接头装置包