| 摘要 |
PROBLEM TO BE SOLVED: To construct a seismic resistant pile head connection structure with high quality, high reliability, and high workability capable of connecting a steel pipe and a steel pipe wound concrete pile using steel bars with hardware, etc., to a foundation slab by using the steel bar with hardware having a material, groove shape, and functions allowing a full penetration weld to the pile head part steel pipe. SOLUTION: In this connection structure for connecting a steel pipe wound concrete pile 2 to a foundation slab 31, hardware 9 having a cross section of any shape enveloping a steel bar 10 and having a groove 13, etc., for inserting, therein, a groove for welding 12 and a backing metal 16 formed therein is formed integrally with the end part of the deformed steel bar 10 by friction welding. By using the steel bar with hardware 8, the steel pipe 3 and the hardware 9 of the pile head part of the steel pipe wound concrete pile 2 are welded to each other to connect a large number of steel bars with hardware 8 to the pile head part.
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