CASTING MOLD OF PILE WITH SPIRAL GROOVE, PRODUCTION OF THE PILE AND PILE WITH SPIRAL GROOVE

摘要

PROBLEM TO BE SOLVED: To industrially produce a pile with a spiral groove with a centrifugal casting. ;SOLUTION: The tube with spiral groove, in which the spiral groove having starting point of spiral line at the end surface of the tube and extended as blade state in the radial direction from a straight tube part in the cross-sectional shape, is integrally formed at the end part of the straight tube part within 360° winding angle, is formed with a casting mold composed of the straight tube part 6 casting the tube with the centrifugal force and a spiral state end surface 6A, on which the end surface 6A is not formed as one circulation, a spiral surface part 7 which extends in the diameter direction with the same surface as the spiral state end surface 6A of the straight tube part 6, and a cylindrical edge part 8 while forms the circumferential end edge of the spiral surface part 7 and has the same axis with the straight tube part 6.;COPYRIGHT: (C)1999,JPO