Construction method of excavated blade-mounted steel pipe and cast-in-place concrete pile for construction of cast-in-place concrete pile

摘要

PROBLEM TO BE SOLVED: To provide an excavation blade fitting steel pipe for constructing a cast-in-place concrete-based pile that enables a concrete-based pile for ground reinforcement of a stable equality to be constructed without being affected by a soil condition at a site, at the same time enabling the concrete-based pile to be constructed readily and reliably at the site.SOLUTION: An excavation blade fitting steel pipe 1 comprises a steel pipe 10, and a tip excavation blade 20 fitted detachably at a tip of the steel pipe and having an excavation blade body 22 on a tip surface. A protrusion 13 is provided on an inner peripheral surface at the tip of the steel pipe 10, while a rotation receiving part 23a is provided on the tip excavation blade 20 for having the tip excavation blade 20 rotate integrally with the steel pipe 10 by bringing the steel pipe 10 in contact with the protrusion 13 when the steel pipe rotates in a prescribed direction of rotation. The rotation receiving part 23a is separated from the inner peripheral surface of the steel pipe 10 toward a center of the steel pipe.SELECTED DRAWING: Figure 5