Method of manufacturing steel pipe pile with inner projection, construction method of steel pipe pile and steel pipe pile with inner projection

摘要

Problem: it is possible to easily dispose a projection at an arbitrary position on the inner surface of the steel pipe after placing the foundation pile at the site without requiring a hot rolling process or a welding process.By expanding the steel pipe 2 from the inside to the outside in the tube radial direction by incremental formingForming a concave groove 21a in the inner surface 2a of the steel pipeThe process of attaching the projection member 4 to the concave groove part 21aAndAfter the steel pipe 2 is expanded from inside to outside by incremental formingProblem to be solved: to provide a method of manufacturing a steel pipe pile with an inner projection, which is characterized in that the projection member 4 is attached to the inner surface 2a of the steel pipe 2 by press working.Diagram