DRILLING EDGE ATTACHMENT STEEL PIPE FOR CONSTRUCTION OF CAST-IN-PLACE CONCRETE SYSTEM PILE, AND CONSTRUCTION METHOD OF CAST-IN-CONTACT SYSTEM PILE

摘要

PROBLEM TO BE SOLVED: To provide a drilling edge attachment steel pipe which can construct a ground reinforcing concrete system pile which is stabilized in quality without being influenced by a state of soil in a site, and is easy in construction in the site, and can surely construct the concrete system pile.;SOLUTION: A drilling edge attachment steel pipe 1 is composed of a steel pipe 10 and a tip drilling edge 20 which is attached to a tip of the steel pipe so as to be detachable, and has a drilling edge body 22 at a tip face. A protrusion 13 protruding to the inside of an inside diameter side is formed at an internal peripheral face of the tip of the steel pipe 10. There are arranged, at the tip drilling edge 20, a rotation receiving body 23a which abuts on the protrusion 13 when the steel pipe 10 rotates in a drilling rotation direction A, and rotates the tip drilling edge 20 integrally with the steel pipe 10, and a separation regulation part 23b which regulates that the steel pipe 10 is locked to the protrusion 13 when pulled up while reversely rotating with respect to the drilling rotation direction, and that the tip drilling edge 20 is separated from the steel pipe 10 in an axial direction. A spiral groove forming edge body 11 which is protruded to an external peripheral side is arranged at a lower end of the steel pipe 10.;COPYRIGHT: (C)2015,JPO&INPIT