Method for manufacturing steel pipe sheet pile having mechanical joint pipe

Abstract

Provided is a method for manufacturing a steel pipe sheet pile including a steel pipe main body, a mechanical joint pipe provided at an end of steel pipe main body, and a joint pipe provided on outer peripheral surfaces of the steel pipe main body and the mechanical joint pipe, in ensuring the circularity of the mechanical joint pipe. The method for manufacturing a steel pipe sheet pile including a mechanical joint pipe according to the invention includes: a first pipe attachment step S1 of attaching a first pipe 15 to the outer peripheral surface of the steel pipe main body 3 away from an end of the steel pipe main body 3 by 200 mm or more; a first slit formation step S3 of forming, after the first pipe attachment step S1, a first slit 15a on the first pipe 15; a mechanical joint pipe attachment step S5 of attaching, after the first slit formation step S3, the mechanical joint pipe 5; a second pipe attachment step S7 of fixing, after the mechanical joint pipe attachment step S5, a second pipe 17 which is provided with a second slit 17a to the outer peripheral surface of the steel pipe main body 3, and welding the end portion of the first pipe 15 and the closer end portion of the second pipe 17; and a slit communicating step S9 of communicating, after the second pipe attachment step S7, the first slit 15a and the second slit 17a.